Locomotive-boiler furnace.



J. H. GROVE.

LOGOMOTIVE BOILER FURNACE.

APPLIUATION FILED 001219, 1908.

Patented July 16,1912.

2 SHEETS-SHEET 1.

J. H. GROVE. LQCOMOTIVE BOILER FURNACE.

APPLICATION FILED 0013.19, 1908.

1,033,007 I Patented July 16, 1912.

2 SHEETS-SHBET 2.

UNITED STATES PATENT orr on.

JAMES H. GROVE, or OMAHA, NEBRASKA, AssIG'Non, Br MESINIECA-SISIIGINIMENTSJ TO AMERICAN ARCH YORK.

COMPANY, or NEW YORK, 1v.--Y., A ooRro xATIoN orN-nw LQCOMOTIVE-BOILER FTiT-RNACE,

- Specification of Letters latent,

Patented July 116 'je re Application filed October 1;9,,130 8. .-Seria1 in}. 453,525.

ing furnaces. V

This presentinventio'n'is a modification? of thatwhich is shown and described in pending application No. 387,442, entitled Liygnite burning furnaces, filed August 7,: 190 I This invention iegalso a modification of, that which is shown and described in my; pending application No, 458,526, entitledf Locomotive boiler furnacesf filed October'i 19, 19,08 l i hedraft in'a locomotiveboilcr furnace is induced by a blowerorexhaust nozzle in the front end or smokebox of the boiler} and is such that unless special care is usedl n firing the furnace, the burning fuel is lifted off of the grate, this is especially the;

case when lignite i's used.

Theobject of my invent-ion is to provide a locomotive boiler furnace in which lignite; may be safely and effectively burned, and myinvention consists generally in a l0comotive boiler furnace comprising a firebox havgf ing a flue sheet atone 'endand a fuel door, at-the opposite. end' in combination with an; inclined front hollow arch arranged to de-' liver air at substantially the center of the box and'to project the same downwardly to; ward the rearsend of the boxQa-second arch occupying a vertical position in the-rear part: of the box above theifron-t arch and contain-;

ing air passages and" openings-forheatin'g and discharging. air'd'ownwardly into the-.;.

box adjacent to the end of the front arch; allas and for the purposes hereinafter-more a i g am e er t eflltt g.i pe .fl al I pe i ea.q we e hetwe eb e e e med the throat of the ,fur liacee'..-,The space D be: 5

fully described andpointed out in the appended cla i1i'1s.- I u My in entionwill= be more-read ly under-j Fi 1 o: l e i e se eree PQQWQ' the line (if ,Fig. 1.-r Fi g.'g4-.f iflzl iistrates the invention .as applied to fireboxes oflthei l supported on studs'lB the side sh'eets'of the,

refractory} bricks and'I; prefer to'notch or,

ing'arch, B,'prefera,bly cccupies a vertical position and is. preferably. somewhat more tive bloiler furnace embodying myinvention,

Fig.2 is a plain view thereof, the crown sheet of the firebox being broken away; to'gliisclose the arches, Fig. '3 ma Vertical'Jse tiQon-Qn e yp l a Infthe drawings 2.1:epresents-the shellvf the "boiler", 3 the flues; g'theflue ishee ti' the rear sheet ofathe fireboxg fi opening}. 71 the fuel door which. closes the. opening; 8, 8, the side sheets; 9,.th'ecrown sheet; and 10 thegrate; In' the front part of the -firebox,1ex tending rearwardl. from the flue sheet, 4, is *anrinclined' ad &' Nicholson hollow arch-,AL 'The air-is supplied to tbe ducts, A, through tubes .qzj. The arch is :built up of refractory bricks, and the air passing therethroughis heated to a high ;..temperature.,-- Upon', emerging ifrom'the ducts, A, the,hot air; undeii high velocity, strikes the. refractory deflectors, A, .andzis. Y thereby, .thrown or deflected downward toward the grate andtoward the rear .e d ofthe firebox '2 -B is a secondrrarch which extends. downwardly fromthe .crowiisheet, 9,.of the fire box; This arch, as well .showii'j-in the drawings is arranged back.of -:the a ri3h, A, with" its lower 'ed'gesubstantially on a level withg-i the top thereof. Theiarch B, is prefer bly project-from name. The arch 'B may be composed of-any suitable number of .90. scallop t e edgesof the bricks which colitact the side and crown sheets to perinitifiow of furnace gases:v uponsaid. sheets and, equal:

ize the .temperaturej,theneof. v Thedependremote/from .the rear" sheetof -the firebo r than. from ,the rear (end oft-he front arch.

The dependent "01;, crown arch, 13, contains air passages, b,.which communicate with the :1 outer gair throughtubes, 6?... .'];he .enti";

ing the arch is heated: to a high degree dischar ed into the firebox throu h holes or slots, 1) ","in thelqwer edgea o .t he'..arc h. Thus it willbeseenthat'heatediair' is pro} jected downwardly'fromboth arches @9 1 quanti y 1 Pemerk ly PPW h il fkQf piecesga'nd part-roles, of coal" The iii low and behind the arches iscalled the fire chamberand the space, E, above and in front-of the arches; A and B is called the combustion chamber. All of the hot gases and combustible products from the firechambcr must pass through the throat, C, to. en tcrthe combustion chamber, E. The action of the exhaust nozzle at the front end of the lines creates a partial vacuum in the firebox; hence air rises through the fuel in su'fiicient qu ntity to support combustion, and air also enters through the hollow arches, A and B, by which the heated air is thrown downward to and or upon the burning fuel.

It will be noted that the hotair from the arches A and B is projected downwardly substantially across and beneath the throat, G, and its velocity is such as to turn or deflect the gases rising from the fuel downward and. toward the rear end of the firebox, there the currents of gas and air rise behind the depending arch B, and to escape through the throat, G, must pass downward beneath said arch, B. The first effect noted is that the light fuel particles and gases from the fuel instead of being permitted to rise directly to the throat of the furnace are precipitated toward the fuel, the force of the streams of air from the arches, A, and B combining with the reduction of the vacuum above the fuel, due to the admission of air through the arches, and tending, to suppress the rise of the gases, fuel particles and cinders. The second efiect which is readily observable is the better combustion of the fuel gases and particles due to thorough ad- .mixture therewith of fresh air from the ing up of the currents or strata of burned and burning gases, lengthening the travel.

of the gases in the fire chamber and giving time for their thorough admixture with air and consequent consumption of the light combustibles and-particles of carbon given up by the mass of lignite on the grate.

J-rfurther and distinct advantage of my invention follows upon the restriction of the throat, C; of the furnace to acomparatively small size through the employment of the vertical hollow arch without covering up the crown sheet of the boiler. It will be notedthat only the upper edge. of the crown arch is presented to the crown sheet and that no other part of the crown sheet is I covered or protected from the currents of gas. The heat from the fire rises back of the arch as well as in front of it and consequently I retain the even heating of the crown and side sheets of the furnace as in other furnaces, and at the same time secure the numerous ad antages before set forth.

As modifications of my invention will readily suggest themselves to one skilled in the art I do not limit my invention to this specific structure herein shown and de scribed.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. A locomotive boner furnace comprising a firebox having a grate and provided with a fine sheet at one end and a fuel door at the opposite end in combination with a crown arch dependingfrom the top of the firebox and supported from the sides of the firebox, said crown arch being adapted to introduce air through itself and project the same downwardly from. the lower edge thereof, an inclined front arch between the flue sheet and the crown arch, said front arch containing air passages formed to de ficct air downwardly adjacent to the lower edge of said crow-n arch, substantially as described.

2. A locomotive boiler furnace comprising a fire box having a line sheet at oneend and a fuel door at the other end, bination with a vertical refractory arch depending from the crown sheet of the furnace, said vert cal arch being scalloped and reduced in thickness at the top to cover up but a small area of the crown sheet, air tubes in the side sheets ofthe furnace, said vertical arch being provided with air conduits communicating with said air tubes and adapted to'rcceivc air therefrom and deliver it downwardly through openings in the bottom of the arch, an inclined rcfrac tory front arch extending rearwardly from said flue sheet to a.point adjacent to the lower edge of said vertical arch, said front arch containing air passages formed to tie fleet air downwardly and rtairwardly adjacent to the lower edge of the said vertical arch, substantially as described.

3. A locomotive boiler furnace comprising a firebox having a gate in the lower part and provided with a line sheet in its front end and a fuel door at. its rear end, in combination with an inclined refractory front arch extending rearwardly and upwardly from a. point adjacent to the lower portion of said flue sheet to the centralportion of the firebox, said arch containing a plurality of air admitting flues having discharge openings arranged and adapted to deliver air downwardly and rearwaially from the upper end of said arch, and, a

in comirtically positioned irzinsyerse crown arch ""Initestir nony' wivhereof, I have .hereunta extending from the top of the firebox down-' set, my hand, this 10th day of OutObQI, 1908, 10

wardly to the central part of the firebox in the presq'nce of two subscribing Witnesses,

slight-1y to the rear of the upper-lend of the front arch, and said crdwntarch containing v H JAMES GROVE air admitting fi'ues having discharge 'open- Witnesses: I ings arranged and adapted to deliver (air P. B. MYERS,

downwardly into the firebqx. Y P. BURGSTROM. H

Copies of his patent may be obtained tu r flve cents each, by afidressing the Commissioner of l atents,

4 Washington, D. 0. 

